US9954221B2 - Cathode active material for lithium rechargeable battery, method of manufacturing the same, and lithium rechargeable battery including the same - Google Patents
Cathode active material for lithium rechargeable battery, method of manufacturing the same, and lithium rechargeable battery including the same Download PDFInfo
- Publication number
- US9954221B2 US9954221B2 US14/250,790 US201414250790A US9954221B2 US 9954221 B2 US9954221 B2 US 9954221B2 US 201414250790 A US201414250790 A US 201414250790A US 9954221 B2 US9954221 B2 US 9954221B2
- Authority
- US
- United States
- Prior art keywords
- active material
- rechargeable battery
- chemical formula
- lithium rechargeable
- cathode active
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active, expires
Links
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/36—Selection of substances as active materials, active masses, active liquids
- H01M4/362—Composites
- H01M4/366—Composites as layered products
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/04—Processes of manufacture in general
- H01M4/0402—Methods of deposition of the material
- H01M4/0419—Methods of deposition of the material involving spraying
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/04—Processes of manufacture in general
- H01M4/0471—Processes of manufacture in general involving thermal treatment, e.g. firing, sintering, backing particulate active material, thermal decomposition, pyrolysis
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/36—Selection of substances as active materials, active masses, active liquids
- H01M4/48—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides
- H01M4/50—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of manganese
- H01M4/505—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of manganese of mixed oxides or hydroxides containing manganese for inserting or intercalating light metals, e.g. LiMn2O4 or LiMn2OxFy
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/36—Selection of substances as active materials, active masses, active liquids
- H01M4/48—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides
- H01M4/52—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of nickel, cobalt or iron
- H01M4/525—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of nickel, cobalt or iron of mixed oxides or hydroxides containing iron, cobalt or nickel for inserting or intercalating light metals, e.g. LiNiO2, LiCoO2 or LiCoOxFy
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M2004/026—Electrodes composed of, or comprising, active material characterised by the polarity
- H01M2004/028—Positive electrodes
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Definitions
- the present invention relates to a cathode active material for a lithium rechargeable battery, a method of manufacturing the same, and a lithium rechargeable battery including the same.
- the battery generates electric power by using a material which can electrochemically react with a cathode and an anode.
- a representative example of the batteries includes a lithium rechargeable battery generating electrical energy by a change in chemical potential when lithium ions are subjected to intercalation/deintercalation in the cathode and the anode.
- the lithium rechargeable battery is manufactured by using a material where reversible intercalation/deintercalation of the lithium ions is feasible as cathode and anode active materials, and charging an organic electrolyte solution or a polymer electrolyte solution between the cathode and the anode.
- a lithium complex metal compound is used as the cathode active material of the lithium rechargeable battery, and complex metal oxides such as LiCoO 2 , LiMn 2 O 4 , LiNiO 2 , LiNi 1-x Co x O 2 (0 ⁇ x ⁇ 1), and LiMnO 2 have been researched as an example thereof.
- a Mn-based cathode active material such as LiMn 2 O 4 and LiMnO 2 can be easily synthesized and is relatively inexpensive, and has the highest thermal stability during over-charging as compared to other active materials, and a low degree of pollution to the environment, and thus is attractive, but has a drawback in that capacity thereof is small.
- LiNiO 2 has a battery characteristic of the highest discharging capacity among the aforementioned cathode active materials, but has a drawback in that it is difficult to synthesize LiNiO 2 . Further, a high oxidation state of nickel becomes a cause of deterioration of the life-span of both a battery and an electrode, and there are problems in that self-discharging is severe and reversibility is poor. Moreover, since stability is not completely secured, there is difficulty in commercialization.
- LiCoO 2 is generalized as an active material having a particle diameter of about 10 ⁇ m, but does not ensure sufficient energy density.
- the present invention has been made in an effort to provide a cathode active material having an improved characteristic.
- the present invention relates to a cathode active material for a lithium rechargeable battery having high initial coulombic efficiency and excellent life-span and output characteristics, a method of manufacturing the same, and a lithium rechargeable battery manufactured using the same.
- An exemplary embodiment of the present invention provides a cathode active material for a lithium rechargeable battery, including: a core including a compound represented by the following Chemical Formula 1; and a coating layer positioned on the core and including a compound represented by the following Chemical Formula 2.
- the cathode active material may further include a reduced graphene oxide layer positioned on the coating layer.
- a thickness of the reduced graphene oxide layer may be 1 to 5 nm.
- a Li/M molar ratio of the entire cathode active material including the core and the coating layer may be 1.05 to 1.6.
- a thickness of the coating layer may be 1 to 13 nm.
- M 1 of Chemical Formula 1 and M 2 of Chemical Formula 2 may include Ni, Co, or Mn.
- Another exemplary embodiment of the present invention provides a method of manufacturing a cathode active material for a lithium rechargeable battery, including: preparing a lithium complex oxide and a basic solution; activating a surface of the lithium complex oxide by adding the lithium complex oxide to the basic solution, and performing mixing and heating; and firing the lithium complex oxide with the activated surface.
- the activating of the surface of the lithium complex oxide by adding the lithium complex oxide to the basic solution and performing mixing and heating may include: heating the basic solution to 30 to 120° C.; and performing agitation after adding the lithium complex oxide to the heated basic solution.
- the performing of agitation after adding the lithium complex oxide to the heated basic solution may take place for 1 to 240 hours.
- the method may further include, before the firing of the lithium complex oxide with the activated surface, drying the lithium complex oxide with the activated surface.
- the drying of the lithium complex oxide with the activated surface may be performed at 80 to 160° C.
- the firing of the lithium complex oxide with the activated surface may be performed at 100 to 900° C.
- the firing of the lithium complex oxide with the activated surface may be performed at 110 to 150° C.
- the basic solution may be a solution having hydrogen ions that are exchanged with lithium ions.
- the basic solution may be a hydrazine solution, an ammonia solution, or a combination thereof.
- the lithium complex oxide may be a lithium complex oxide in which a graphene oxide layer is formed.
- the lithium complex oxide in which the graphene oxide layer is formed may be prepared by: preparing a solution in which a graphene oxide is dispersed; performing agitation after adding the lithium complex oxide to the solution; and obtaining the lithium complex oxide in which the reduced graphene oxide layer is formed by using the solution where the graphene oxide and the lithium complex oxide are agitated by a spray drying method.
- the cathode active material formed by the manufacturing method may include: a core including a compound represented by the following Chemical Formula 1; a coating layer positioned on the core and including a compound represented by the following Chemical Formula 2; and the reduced graphene oxide layer positioned on the coating layer.
- the cathode active material formed by the manufacturing method may include: a core including a compound represented by the following Chemical Formula 1; and a coating layer positioned on the core and including a compound represented by the following Chemical Formula 2.
- Yet another exemplary embodiment of the present invention provides a lithium rechargeable battery including: a cathode including the cathode active material for the lithium rechargeable battery according to the aforementioned exemplary embodiments of the present invention; an anode including an anode active material; and an electrolyte.
- a cathode active material for a lithium rechargeable battery having high initial coulombic efficiency and excellent life-span and output characteristics, a method of manufacturing the same, and a lithium rechargeable battery manufactured using the same.
- FIG. 1 shows XRD analysis results of Examples 1 and 2 and Comparative Example 1.
- FIG. 2 shows SEM photographs of active materials according to the examples and the comparative examples.
- FIG. 3 shows TEM photographs of the active material according to Example 1.
- FIG. 4 shows TEM photographs of the active material according to Example 2.
- FIG. 5 is a graph illustrating life-span characteristics of batteries according to Example 5 and Comparative Example 2.
- FIG. 6 is a graph illustrating initial efficiency characteristics of batteries according to Example 7 and Comparative Example 2.
- FIG. 7 is a graph illustrating output characteristics of batteries according to Examples 5, 6, and 7 and Comparative Example 2.
- FIG. 8 is a graph illustrating life-span and operation voltage characteristics of batteries according to Example 7 and Comparative Example 2.
- FIG. 9 is a graph illustrating the life-span characteristics according to Example 7 and Comparative Example 2 after initial charging/discharging at 2.0 to 4.8 V.
- An exemplary embodiment of the present invention may provide a cathode active material for a lithium rechargeable battery having high initial coulombic efficiency and excellent life-span and output characteristics, a method of manufacturing the same, and a lithium rechargeable battery manufactured using the same.
- a structurally and electrochemically stable coating layer may be formed on a surface of the active material by chemically activating a Li 2 MnO 3 phase of the surface of the active material by using an aqueous solution (e.g., a basic solution) including hydrogen ions, and then performing heat treatment.
- aqueous solution e.g., a basic solution
- the cathode active material for the lithium rechargeable battery according to the exemplary embodiment of the present invention may further include a reduced graphene oxide layer having excellent electrical conductivity as the coating layer.
- the exemplary embodiment of the present invention provides the cathode active material for the lithium rechargeable battery including a core including a compound represented by the following Chemical Formula 1, and a coating layer positioned on the core and including a compound represented by the following Chemical Formula 2.
- a structure of the compound represented by Chemical Formula 2 is a structure in which lithium which is generated by a manufacturing method using a basic solution as will be described below is eliminated. This structure is structurally and electrochemically stable, and may improve the life-span and output characteristics of the battery.
- a thickness of the coating layer may be 1 to 13 nm, and more specifically 1 to 10 nm.
- the life-span and output characteristics may be slightly changed according to a thickness range, and an agitation time as will be described below may be controlled according to a target thickness.
- the cathode active material may further include a reduced graphene oxide layer positioned on the coating layer.
- a thickness of the reduced graphene oxide layer may be 1 to 5 nm. The thickness range can be optionally adjusted according to the characteristic of the active material, but is not limited thereto.
- a Li/M molar ratio of the entire cathode active material including the core and the coating layer may be 1.05 to 1.6, and more specifically 1.1 to 1.35. This ratio is a ratio of elimination of Li as compared to an initially added raw material, and may be changed according to the thickness of the coating layer.
- M 1 of Chemical Formula 1 and M 2 of Chemical Formula 2 may be Ni, Co, or Mn. All transition metals already known in the art can be used, so M 1 and M 2 are not limited thereto.
- Another exemplary embodiment of the present invention provides a method of manufacturing a cathode active material for a lithium rechargeable battery, including: preparing a lithium complex oxide and a basic solution; activating a surface of the lithium complex oxide by adding the lithium complex oxide to the basic solution, and performing mixing and heating; and firing the lithium complex oxide with the activated surface.
- the activating of the surface of the lithium complex oxide by adding the lithium complex oxide to the basic solution and performing mixing and heating may include: heating the basic solution to 30 to 120° C.; and performing agitation after adding the lithium complex oxide to the heated basic solution.
- the performing of agitation after adding the lithium complex oxide to the heated basic solution may take place for 1 to 240 hours, and more specifically 1 to 20 hours.
- the thickness of the aforementioned coating layer may be controlled according to the agitation time.
- the method may further include, before the firing of the lithium complex oxide with the activated surface, drying the lithium complex oxide with the activated surface.
- the drying of the lithium complex oxide with the activated surface may be performed at 80 to 160° C. However, the drying is not limited thereto.
- the firing of the lithium complex oxide with the activated surface may be performed at 100 to 900° C., more specifically 110 to 220° C., and more specifically 110 to 150° C. However, the firing is not limited thereto.
- the basic solution may be a solution having hydrogen ions exchanged with lithium ions.
- the basic solution may be a hydrazine solution, an ammonia solution, or a combination thereof.
- the basic solution is not limited thereto.
- the lithium complex oxide may be a lithium complex oxide in which a graphene oxide layer is formed.
- the lithium complex oxide in which a graphene oxide layer is formed may be prepared by: preparing a solution in which a graphene oxide is dispersed; performing agitation after adding the lithium complex oxide to the solution; and obtaining the lithium complex oxide in which the graphene oxide layer is formed by using the solution where the graphene oxide and the lithium complex oxide are agitated by a spray drying method. Since the spray drying method is well known in the art, a detailed description thereof will be omitted.
- the cathode active material prepared by the manufacturing method may include the core including the compound represented by the following Chemical Formula 1, the coating layer positioned on the core and including the compound represented by the following Chemical Formula 2, and the reduced graphene oxide layer positioned on the coating layer.
- the cathode active material prepared by the manufacturing method may include the core including the compound represented by the following Chemical Formula 1, and the coating layer positioned on the core and including the compound represented by the following Chemical Formula 2.
- the cathode active material according to the exemplary embodiment of the present invention may be effectively used in a cathode of the lithium rechargeable battery.
- the lithium rechargeable battery includes an anode including an anode active material and an electrolyte together with the cathode.
- the cathode is manufactured by mixing the cathode active material according to the exemplary embodiment of the present invention, a conductive material, a binder, and a solvent to manufacture a cathode active material composition, and then directly applying and drying the cathode active material composition on an aluminum current collector.
- the cathode can be manufactured by casting the cathode active material composition on a separate support, and then laminating a film obtained by stripping the cathode active material from the support on an aluminum current collector.
- carbon black, graphite, or a metal powder is used as the conductive material
- a vinylidene fluoride/hexafluoropropylene copolymer, polyvinylidene fluoride, polyacrylonitrile, polymethyl methacrylate, polytetrafluoroethylene, and a mixture thereof are feasible as the binder.
- N-methylpyrrolidone, acetone, tetrahydrofuran, decane, and the like are used as the solvent.
- the cathode active material, the conductive material, the binder, and the solvent are used in a content at a level typically used in the lithium rechargeable battery.
- the anode is manufactured by mixing an cathode active material, a binder, and a solvent to manufacture an anode active material composition, directly applying the anode active material composition on a copper current collector or casting the anode active material composition on a separate support, and laminating an anode active material film stripped from the support on the copper current collector.
- the anode active material composition may further contain a conductive material.
- a material where intercalation/deintercalation of lithium is feasible is used as the anode active material, and for example, a lithium metal or a lithium alloy, cokes, artificial graphite, natural graphite, organic polymer compound combustion bodies, carbon fibers, and the like are used. Further, the conductive material, the binder, and the solvent are used identically to those of the aforementioned cathode.
- All separators typically used in the lithium rechargeable battery can be used, and for example, polyethylene, polypropylene, polyvinylidene fluoride, or a multilayer of two or more layers thereof may be used, and needless to say, a mixed multilayer such as a polyethylene/polypropylene two-layered separator, a polyethylene/polypropylene/polyethylene three-layered separator, and a polypropylene/polyethylene/polypropylene three-layered separator may be used.
- a non-aqueous electrolyte, a known solid electrolyte, or the like can be used as the electrolyte charged in the lithium rechargeable battery, and an electrolyte where a lithium salt is dissolved is used.
- the solvent of the non-aqueous electrolyte is not particularly limited, but cyclic carbonates such as ethylene carbonate, propylene carbonate, butylene carbonate, and vinylene carbonate; chained carbonates such as dimethyl carbonate, methylethyl carbonate, and diethyl carbonate; esters such as methyl acetate, ethyl acetate, propyl acetate, methyl propionate, ethyl propionate, and ⁇ -butyrolactone; ethers such as 1,2-dimethoxyethane, 1,2-diethoxyethane, tetrahydrofuran, 1,2-dioxane, and 2-methyltetrahydrofuran; nitriles such as acetonitrile; amides such as dimethylformamide; and the like may be used.
- cyclic carbonates such as ethylene carbonate, propylene carbonate, butylene carbonate, and vinylene carbonate
- chained carbonates such
- a gel-shaped polymer electrolyte where an electrolyte solution is impregnated in a polymer electrolyte such as polyethylene oxide and polyacrylonitrile, or an inorganic solid electrolyte such as LiI and Li 3 N, is feasible as the electrolyte.
- LiPF 6 LiBF 4 , LiSbF 6 , LiAsF 6 , LiCIO 4 , LiCF 3 SO 3 , Li(CF 3 SO 2 ) 2 N, LiC 4 F 9 SO 3 , LiSbF 6 , LiAlO 4 , LiAICl 4 , LiC, and LiI is feasible as the lithium salt.
- Drying was then performed at a temperature of 120° C. for 12 hours, and heat treatment was performed at a temperature of 200° C. for 3 hours.
- the cathode active material for the lithium rechargeable battery was manufactured.
- the composition of the manufactured cathode active material for the lithium rechargeable battery was 0.33Li 2 MnO 3 -0.6LiNi 1/3 Mn 1/3 Co 1/3 O 2 .
- Drying was then performed at a temperature of 120° C. for 12 hours, and heat treatment was performed at a temperature of 200° C. for 3 hours.
- the cathode active material for the lithium rechargeable battery was manufactured.
- the composition of the manufactured cathode active material for the lithium rechargeable battery was 0.18Li 2 MnO 3 -0.6LiNi 1/3 Mn 1/3 Co 1/3 O 2 .
- Spraying was then performed into the cylinder at 190° C. by using a spray drier.
- the cathode active material for the lithium rechargeable battery was manufactured.
- the composition of the manufactured cathode active material for the lithium rechargeable battery was 0.4Li 2 MnO 3 -0.6LiNi 1/3 Mn 1/3 Co 1/3 O 2 , the surface of which was coated with graphene oxide.
- Example 4 Manufacturing of Cathode Active Material for Lithium Rechargeable Battery
- Drying was then performed at a temperature of 120° C. for 12 hours, and heat treatment was performed at a temperature of 200° C. for 3 hours.
- the cathode active material for the lithium rechargeable battery was manufactured.
- the composition of the manufactured cathode active material for the lithium rechargeable battery was 0.33Li 2 MnO 3 -0.6LiNi 1/3 Mn 1/3 Co 1/3 O 2 , the surface of which was coated with reduced graphene oxide.
- the cathode active material for the lithium rechargeable battery manufactured in Example 1, Super-P as a conductive material, and polyvinylidene fluoride (PVdF) as a binder were mixed at the weight ratio of 8:1:1 to manufacture a slurry.
- the slurry was uniformly applied on an aluminum foil having a thickness of 15 ⁇ m, and vacuum-dried at a temperature of 120° C. to manufacture a cathode.
- a half cell was manufactured by using the manufactured cathode and a lithium foil as the counter electrode, and using the liquid electrolyte solution in which LiPF 6 was dissolved in a concentration of 1.0 M in the solvent where porous polyethylene carbonate, ethylmethyl carbonate, and dimethyl carbonate were mixed at a volume ratio of 3:4:3, according to the typically known manufacturing process.
- Example 5 The same procedure as Example 5 was performed to manufacture a coin half cell, except that the cathode active material for the lithium rechargeable battery manufactured in Example 2 was used.
- Example 5 The same procedure as Example 5 was performed to manufacture a coin half cell, except that the cathode active material for the lithium rechargeable battery manufactured in Example 4 was used.
- the compound represented by 0.4Li 2 MnO 3 -0.6LiNi 1/3 Mn 1/3 Co 1/3 O 2 was used as the cathode active material for the lithium rechargeable battery.
- Example 5 The same procedure as Example 5 was performed to manufacture a coin half cell, except that the cathode active material for the lithium rechargeable battery of Comparative Example 1 was used.
- FIG. 1 shows XRD analysis results of Examples 1 and 2 and Comparative Example 1.
- FIG. 2 shows SEM photographs of the active materials according to the examples and the comparative examples. After the cathode active materials for the lithium rechargeable batteries of Example 1 and Comparative Example 1 were sampled on a carbon tape, platinum (Pt) plasma coating was performed to take SEM photographs. To be more specific, a description of each picture in FIG. 2 is as follows.
- FIG. 3 shows TEM photographs of the active material according to Example 1. It can be confirmed that a 2 to 3 nm coating layer is formed on the surface.
- FIG. 4 shows TEM photographs of the active material according to Example 2. It can be confirmed that the coating layer of around 13 nm is formed on the surface. That is, it can be seen that the thickness of the coating layer can be adjusted according to the treatment time.
- FIG. 5 is a graph illustrating life-span characteristics of the batteries according to Example 5 and Comparative Example 2.
- the number of the used active material was used for identification. More specifically, the life-span characteristic was measured at 2.0 to 4.6 V after the first cycle at room temperature/2.0 to 4.7 V (1C-rate).
- FIG. 6 is a graph illustrating initial efficiency characteristics of the batteries according to Example 7 and Comparative Example 2.
- FIG. 7 is a graph illustrating output characteristics of the batteries according to Examples 5, 6, and 7 and Comparative Example 2.
- the coin-cells using the active materials of Examples 1 and 4 have the better output characteristic as compared to the coin-cell using Comparative Example 1, but in the case of Example 2, the output characteristic is inferior to that of Comparative Example 1. That is, it can be seen that the output characteristic of the battery is partially affected by the thickness of the coating layer according to the hydrazine treatment time.
- FIG. 8 is a graph illustrating the life-span and operation voltage characteristics of the batteries according to Example 7 and Comparative Example 2.
- Example 7 and Comparative Example 2 have the similar life-span characteristics, in the case of Example 7, an operation voltage reduction is small.
- FIG. 9 is a graph illustrating the life-span characteristics according to Example 7 and Comparative Example 2 after initial charging/discharging at 2.0 to 4.8 V.
- Example 7 has the improved life-span characteristic as compared to the coin-cell according to Comparative Example 2.
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Inorganic Chemistry (AREA)
- Composite Materials (AREA)
- Battery Electrode And Active Subsutance (AREA)
Abstract
xLi2MnO3—(1-x)LiM1O2 [Chemical Formula 1]
-
- In Chemical Formula 1, 0<x<1 and M1 is a transition metal.
yMnOz—(1-y)LiM2O2 [Chemical Formula 2] - In Chemical Formula 2, 0<y<1, 1≤z≤4, and M2 is a transition metal.
- In Chemical Formula 1, 0<x<1 and M1 is a transition metal.
Description
xLi2MnO3—(1-x)LiM1O2 [Chemical Formula 1]
yMnOz—(1-y)LiM2O2 [Chemical Formula 2]
xLi2MnO3—(1-x)LiM1O2 [Chemical Formula 1]
yMnOz—(1-y)LiM2O2 [Chemical Formula 2]
xLi2MnO3—(1-x)LiM1O2 [Chemical Formula 1]
yMnOz—(1-y)LiM2O2 [Chemical Formula 2]
xLi2MnO3—(1-x)LiM1O2 [Chemical Formula 1]
yMnOz—(1-y)LiM2O2 [Chemical Formula 2]
xLi2MnO3—(1-x)LiM1O2 [Chemical Formula 1]
yMnOz—(1-y)LiM2O2 [Chemical Formula 2]
xLi2MnO3—(1-x)LiM1O2 [Chemical Formula 1]
yMnOz—(1-y)LiM2O2 [Chemical Formula 2]
TABLE 1 | ||||||
Li/M ratio | ||||||
Li | Mn | Co | Ni | (molar ratio) | ||
Comparative | 7.01 | 3.01 | 0.98 | 1.00 | 1.41 |
Example 1 | |||||
Example 1 | 6.46 | 2.99 | 0.98 | 1.00 | 1.3 |
Claims (6)
xLi2MnO3—(1-x)LiM1O2 [Chemical Formula 1]
yMnOz—(1-y)LiM2O2 [Chemical Formula 2]
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1020130147677A KR101646994B1 (en) | 2013-11-29 | 2013-11-29 | Positive active material for rechargeable lithium battery, method for manufacturing the same, and rechargeable lithium battery including the same |
KR10-2013-0147677 | 2013-11-29 |
Publications (2)
Publication Number | Publication Date |
---|---|
US20150155553A1 US20150155553A1 (en) | 2015-06-04 |
US9954221B2 true US9954221B2 (en) | 2018-04-24 |
Family
ID=53266070
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US14/250,790 Active 2036-09-22 US9954221B2 (en) | 2013-11-29 | 2014-04-11 | Cathode active material for lithium rechargeable battery, method of manufacturing the same, and lithium rechargeable battery including the same |
Country Status (2)
Country | Link |
---|---|
US (1) | US9954221B2 (en) |
KR (1) | KR101646994B1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN110233266A (en) * | 2019-07-02 | 2019-09-13 | 宁夏汉尧石墨烯储能材料科技有限公司 | A kind of preparation method of graphene modification lithium-ion battery tertiary cathode material |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN116845332A (en) | 2016-07-05 | 2023-10-03 | 株式会社半导体能源研究所 | Electronic device, lithium ion secondary battery, positive electrode active material, and method for producing same |
WO2018026650A1 (en) * | 2016-08-02 | 2018-02-08 | Apple Inc. | Coated nickel-based cathode materials and methods of preparation |
KR102307001B1 (en) * | 2017-04-28 | 2021-09-30 | 항저우 고우시 테크놀로지 컴퍼니 리미티드 | Paperball-type graphene microspheres and their composite material and manufacturing method |
KR101957233B1 (en) * | 2017-08-31 | 2019-03-13 | 경희대학교 산학협력단 | A cathode active material for lithium secondary battery and a method of preparing the same |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20080241693A1 (en) * | 2007-03-30 | 2008-10-02 | Minoru Fukuchi | Lithium transition metal complex oxide for lithium ion secondary battery cathode active material and method for producing the same, lithium ion secondary battery cathode active material, and lithium ion secondary battery |
US20090235721A1 (en) * | 2008-03-20 | 2009-09-24 | The Government Of The United States Of America, As Represented By The Secretary Of The Navy | Reduced graphene oxide film |
CN102169979A (en) * | 2010-02-26 | 2011-08-31 | 比亚迪股份有限公司 | Activating method of cathode material |
US20120088151A1 (en) * | 2010-10-08 | 2012-04-12 | Semiconductor Energy Laboratory Co., Ltd. | Positive-electrode active material and power storage device |
KR20120095803A (en) | 2011-02-21 | 2012-08-29 | 주식회사 엘지화학 | Positive-electrode active material with high power at the low soc and lithium secondary battery including them |
-
2013
- 2013-11-29 KR KR1020130147677A patent/KR101646994B1/en active IP Right Grant
-
2014
- 2014-04-11 US US14/250,790 patent/US9954221B2/en active Active
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20080241693A1 (en) * | 2007-03-30 | 2008-10-02 | Minoru Fukuchi | Lithium transition metal complex oxide for lithium ion secondary battery cathode active material and method for producing the same, lithium ion secondary battery cathode active material, and lithium ion secondary battery |
US20090235721A1 (en) * | 2008-03-20 | 2009-09-24 | The Government Of The United States Of America, As Represented By The Secretary Of The Navy | Reduced graphene oxide film |
CN102169979A (en) * | 2010-02-26 | 2011-08-31 | 比亚迪股份有限公司 | Activating method of cathode material |
US20120088151A1 (en) * | 2010-10-08 | 2012-04-12 | Semiconductor Energy Laboratory Co., Ltd. | Positive-electrode active material and power storage device |
KR20120095803A (en) | 2011-02-21 | 2012-08-29 | 주식회사 엘지화학 | Positive-electrode active material with high power at the low soc and lithium secondary battery including them |
Non-Patent Citations (1)
Title |
---|
Office Action, Korea Intellectual Property Office, dated Jan. 26, 2016, Korean Patent Application No. 10-2013-0147677. |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN110233266A (en) * | 2019-07-02 | 2019-09-13 | 宁夏汉尧石墨烯储能材料科技有限公司 | A kind of preparation method of graphene modification lithium-ion battery tertiary cathode material |
Also Published As
Publication number | Publication date |
---|---|
KR20150062724A (en) | 2015-06-08 |
US20150155553A1 (en) | 2015-06-04 |
KR101646994B1 (en) | 2016-08-10 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US11855282B2 (en) | Pre-lithiated electrode materials and cells employing the same | |
US9972835B2 (en) | Positive active material for rechargeable lithium battery, method for manufacturing the same, and rechargeable lithium battery including the same | |
JP4725594B2 (en) | Method for manufacturing lithium secondary battery | |
JP5882516B2 (en) | Lithium secondary battery | |
US20160380309A1 (en) | Long-life lithium-ion batteries | |
JP2010080105A (en) | Method of manufacturing nonaqueous electrolyte secondary battery | |
JP2010140901A (en) | Anode active material for lithium secondary cell, method for manufacturing the same, and lithium secondary cell equipped with anode active material | |
JP6256001B2 (en) | Manufacturing method of secondary battery | |
US9954221B2 (en) | Cathode active material for lithium rechargeable battery, method of manufacturing the same, and lithium rechargeable battery including the same | |
JP3911870B2 (en) | Electrolyte for lithium secondary battery and lithium secondary battery using the same | |
JP2009064715A (en) | Positive electrode and lithium secondary battery using the same | |
US20240290973A1 (en) | Electrode plate, lithium-ion battery, battery module, battery pack and electric device | |
JP2008305688A (en) | Negative electrode for nonaqueous electrolyte secondary battery and nonaqueous electrolyte secondary battery using the negative electrode | |
KR20220046267A (en) | Anodeless lithium secondary battery and preparing method thereof | |
JP2012252951A (en) | Nonaqueous electrolyte secondary battery | |
JP2002237331A (en) | Lithium secondary battery | |
CN113557615A (en) | Negative electrode for nonaqueous electrolyte secondary battery | |
JP3327468B2 (en) | Lithium ion secondary battery and method of manufacturing the same | |
KR101609244B1 (en) | Positive active material for rechargeable lithium battery, method for manufacturing the same, and rechargeable lithium battery including the same | |
JP2013016347A (en) | Secondary battery | |
KR101627847B1 (en) | Positive active material for rechargeable lithium battery, and method for manufacturing the same | |
JP6961939B2 (en) | Negative electrode agent for non-aqueous electrolyte secondary battery, negative electrode for non-aqueous electrolyte secondary battery and non-aqueous electrolyte secondary battery | |
US20200076000A1 (en) | Non-aqueous electrolyte and non-aqueous electrolyte secondary battery | |
KR101675480B1 (en) | Positive active material for rechargeable lithium battery, method of preparing the same, and rechargeable lithium battery including the same | |
JP2001307717A (en) | Non-aqueous electrolyte secondary battery |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: UNIST ACADEMY-INDUSTRY RESEARCH CORPORATION, KOREA Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:CHO, JAEPHIL;OH, PILGUN;REEL/FRAME:032656/0605 Effective date: 20140407 |
|
AS | Assignment |
Owner name: ULSAN NATIONAL INSTITUTE OF SCIENCE AND TECHNOLOGY Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:UNIST ACADEMY-INDUSTRY RESEARCH CORPORATION;REEL/FRAME:037759/0103 Effective date: 20160212 |
|
AS | Assignment |
Owner name: UNIST (ULSAN NATIONAL INSTITUTE OF SCIENCE AND TECHNOLOGY), KOREA, REPUBLIC OF Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:ULSAN NATIONAL INSTITUTE OF SCIENCE AND TECHNOLOGY;REEL/FRAME:038238/0905 Effective date: 20160323 Owner name: UNIST (ULSAN NATIONAL INSTITUTE OF SCIENCE AND TEC Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:ULSAN NATIONAL INSTITUTE OF SCIENCE AND TECHNOLOGY;REEL/FRAME:038238/0905 Effective date: 20160323 |
|
STCF | Information on status: patent grant |
Free format text: PATENTED CASE |
|
MAFP | Maintenance fee payment |
Free format text: PAYMENT OF MAINTENANCE FEE, 4TH YR, SMALL ENTITY (ORIGINAL EVENT CODE: M2551); ENTITY STATUS OF PATENT OWNER: SMALL ENTITY Year of fee payment: 4 |
|
AS | Assignment |
Owner name: SM LAB CO.,LTD., KOREA, REPUBLIC OF Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:UNIST (ULSAN NATIONAL INSTITUTE OF SCIENCE AND TECHNOLOGY);REEL/FRAME:060605/0282 Effective date: 20220722 |